Which aspect is NOT a part of physical activity definitions?

The choice identifying deliberate exercise sessions only is not considered a comprehensive part of physical activity definitions because physical activity encompasses a broader range of movements beyond structured exercise. Physical activity includes any form of bodily movement produced by skeletal muscles that result in energy expenditure. This can be as simple as daily activities like walking, gardening, or playing with children, which all contribute to overall energy expenditure and health.

While structured exercise is undoubtedly an important component of physical fitness, the definition of physical activity is more inclusive. It recognizes that numerous incidental motions throughout daily life also significantly impact health and fitness, making it essential to consider physical activity as a holistic concept that involves various forms of movement, both planned and incidental. This understanding supports the promotion of an active lifestyle where individuals are encouraged to incorporate more movement into their daily routines, not just through formal exercise sessions.